My guess is that Pochi didn't actually eat the Nuke Devil. Instead, someone or something altered either time/reality to temporarily undo their invention, or altered humanity's perception, causing them (and by extension, Yoru) to forget nukes still existed.
Ah, I think get it. Fire is the element of transformation. It turns ice into water, then into steam. It turns raw meat into cooked food. It turns ore into metal. It turns darkness into light. It turns wood into charcoal. It's the quintessential chemical reaction. Thus, it could in fact give...
I expect that once Pig-face's plan blows up in his face, the Gold King will find that the price of Rose Marins has made a sudden and steep increase due to 'quality assurance'...